3990972 has 24 divisors (see below), whose sum is σ = 9426816. Its totient is φ = 1313968.

The previous prime is 3990967. The next prime is 3990977. The reversal of 3990972 is 2790993.

It is an interprime number because it is at equal distance from previous prime (3990967) and next prime (3990977).

It is a self number, because there is not a number n which added to its sum of digits gives 3990972.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3990977) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1008 + ... + 2999.

It is an arithmetic number, because the mean of its divisors is an integer number (392784).

Almost surely, 2^3990972 is an apocalyptic number.

It is an amenable number.

3990972 is an abundant number, since it is smaller than the sum of its proper divisors (5435844).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

3990972 is a wasteful number, since it uses less digits than its factorization.

3990972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4097 (or 4095 counting only the distinct ones).

The product of its (nonzero) digits is 30618, while the sum is 39.

The square root of 3990972 is about 1997.7417250486. The cubic root of 3990972 is about 158.6205897638.

The spelling of 3990972 in words is "three million, nine hundred ninety thousand, nine hundred seventy-two".